The controller system cost about $79.The bucket chamber including light and foil and glue comes out to about $24.This doesn't include cost of filament but probably $5 max in filament.It's pretty safe to say you could build it for about $100 give or take a bit. It was more the experience of building my own control system moreso than it was "can I make it super cheap". This also ensures the temperature is correct for each filament you put in versus heating the chamber and hoping it gets hot enough....but not too hot :)